<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function area(width,height){
            let s=width*height;
            return s;
        }
        export{area};
        //rectPluse.js文件
        export*from './rect.js';//继承模块
        export let pi=3.1415;
        export default function(width,height){
        let m=2*(width+height);
        return m;
        }

        //index.html文件
        import*as rectplus from './rectPlus.js'
        console.log(rectplus.area(3,5));//继承自父模板
        console.log(rectplus.pi)

        import perim from './rectPlus.js';
        console.log(perim(4,6))

    </script>
</body>
</html>